Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a3b344f1bef53a…

MALICIOUS

PDF

68.2 KB Created: 2021-05-12 04:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f7709283faed84c5fd6a71437e9235 SHA-1: 86427a5b6b158f3ae5e95f2d95b79e21d211d810 SHA-256: e3a3b344f1bef53a89568704c8bed84d586cf0c9d88a30af889e5cc1b11dfe10
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure related to 'supplier approval forms'. The presence of multiple links and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7805

Heuristics 4

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=supplier+approval+form+example
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/pk00f4svg4m34elqm2bc0ps8ju/rutarutesizevago.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455cae3700---19296487317.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/62eebfb8a81b5b9976cfcef521523691/46363686248.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/aa66a401ee0172397d1202ea5b2308c1/zidesafovupadokowox.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e013bf89a22697b35717054eeb0b324e/57827897413.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9e5268e3a24fef9cb3c9dba881898077/56287107716.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160720d9820967---tevozesutobazasikaxuf.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f7625b1a0794b1c2283fc6e092ca889d/kubonutovan.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d2fd94c3a0205f6b557887d190b8778f/lilikun.pdf
    • http://ajtoablakcentrum.com/_user/file/rexudijelasaxisireletave.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9t959vk8kj9mccjtla99t15gqa/sabas.pdf
    • http://aj-logistics.com/stock/userfiles/file/60697001904.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0a1c4d8b---zewarolatagabagovaza.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607793b0f16ca---26187447266.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a75a2a57e---81270384034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e2.bin
38ce6478e1aadecc3fdc28fc3a0714899db5de6f361c66872721b79bd880bb9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 4796 bytes
font_01_sfnt_off0000e835.bin
194329057ff72b7d19209e8123560c81b1c811993056ffe49d3c6d2871178754		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 10752 bytes

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